Question

这是我尝试运行的查询：

Select Status from [transaction] where TransactionID IN (select MAX(CAST(TransactionID AS VARCHAR(36))), sum(debit) 
FROM [transaction]
WHERE  dbo.getday(StartSaleTime) >= '5/1/2011' and dbo.getday(StartSaleTime) <= '5/3/2011'  and Status > -1 And TransactionNo like 'EL%' And TransactionType = 4 
GROUP BY CustomerID, debit HAVING ( COUNT(CustomerID) > 1 ))

它会返回此错误：

Only one expression can be specified in the select list when the subquery is not introduced with EXISTS.

Answer 1

您正在选择两件事并尝试将其与IN（）一起使用。在尝试执行someId In（ID列表）时，您应该只选择ID。

Answer 2

它告诉您错误消息中到底出了什么问题。使用in时，您只能在选择列表中指定一列。

如果您将查询更改为此，则应该可以正常工作。

Select Status from [transaction] where TransactionID 

IN (select MAX(CAST(TransactionID AS VARCHAR(36))) as [TransactionID]
FROM [transaction]
WHERE  dbo.getday(StartSaleTime) >= '5/1/2011' and dbo.getday(StartSaleTime) <= '5/3/2011'  and Status > -1 And TransactionNo like 'EL%' And TransactionType = 4 
GROUP BY CustomerID, debit HAVING ( COUNT(CustomerID) > 1 ))

您可以指定多个列，但仅限于使用EXISTS而不是IN

时

Answer 3

您的子查询必须只返回一个字段。现在你要返回两个，所以总体查询看起来有点像：

SELECT ... WHERE TransactionID IN ((a,b), (c,d), etc...)

SQL服务器不知道哪个列用于IN的东西，所以它在抱怨。

使用WHERE IN查询时出错

3 个答案: